Reaction.h

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#ifndef __RD_REACTION_H_17Aug2006__
#define __RD_REACTION_H_17Aug2006__

#include <GraphMol/RDKitBase.h>
#include <GraphMol/Substruct/SubstructMatch.h>
#include <vector>

namespace RDKit{
     
  //! used to indicate an error in the chemical reaction engine
  class ChemicalReactionException : public std::exception {
  public:
    //! construct with an error message
    explicit ChemicalReactionException(const char *msg) : _msg(msg) {};
    //! construct with an error message
    explicit ChemicalReactionException(const std::string msg) : _msg(msg) {};
    //! get the error message
    const char *message () const { return _msg.c_str(); };
    ~ChemicalReactionException () throw () {};
  private:
    std::string _msg;
  };
   
  //! This is a class for storing and applying general chemical reactions.
  /*!
     basic usage will be something like:
     
     \verbatim
     ChemicalReaction rxn;
     rxn.addReactantTemplate(r1);
     rxn.addReactantTemplate(r2);
     rxn.addProductTemplate(p1);
     rxn.initReactantMatchers();
     
     MOL_SPTR_VECT prods;
     for(MOL_SPTR_VECT::const_iterator r1It=reactantSet1.begin();
         r1It!=reactantSet1.end();++r1It;){
       for(MOL_SPTR_VECT::const_iterator r2It=reactantSet2.begin();
           r2It!=reactantSet2.end();++r2It;){
         MOL_SPTR_VECT rVect(2);
         rVect[0] = *r1It;
         rVect[1] = *r2It;
             
         std::vector<MOL_SPTR_VECT> lprods;
         lprods = rxn.runReactants(rVect);
         for(std::vector<MOL_SPTR_VECT>::const_iterator lpIt=lprods.begin();
            lpIt!=lprods.end();++lpIt){
            // we know this is a single-product reaction:
            prods.push_back((*lpIt)[0]);
         }
       }     
     }
     \endverbatim     

  */
  class ChemicalReaction {
  public:
    ChemicalReaction() : df_needsInit(true), df_implicitProperties(false) {};
    ChemicalReaction(const ChemicalReaction &other){
        df_needsInit=true;
        df_implicitProperties=other.df_implicitProperties;
        m_reactantTemplates=other.m_reactantTemplates;
        m_productTemplates=other.m_productTemplates;
    }
    //! Adds a new reactant template
    /*!
      \return the number of reactants

    */
    unsigned int addReactantTemplate(ROMOL_SPTR mol){
      this->df_needsInit = true;
      this->m_reactantTemplates.push_back(mol);
      return this->m_reactantTemplates.size();
    }

    //! Adds a new product template
    /*!
      \return the number of products

    */
    unsigned int addProductTemplate(ROMOL_SPTR mol){
      this->m_productTemplates.push_back(mol);
      return this->m_productTemplates.size();
    }
    
      
    //! Runs the reaction on a set of reactants
    /*!
     
      \param reactants: the reactants to be used. The length of this must be equal to
                        this->getNumReactantTemplates()
                         
      \return a vector of vectors of products. Each subvector will be this->getNumProductTemplates()
              long.          
      
      We return a vector of vectors of products because each individual template may map multiple times
      onto its reactant. This leads to multiple possible result sets.
    */
    std::vector<MOL_SPTR_VECT> runReactants(const MOL_SPTR_VECT reactants) const;

    MOL_SPTR_VECT::const_iterator beginReactantTemplates() const {
        return this->m_reactantTemplates.begin();    
    }
    MOL_SPTR_VECT::const_iterator endReactantTemplates() const {
        return this->m_reactantTemplates.end();    
    }

    MOL_SPTR_VECT::const_iterator beginProductTemplates() const {
        return this->m_productTemplates.begin();    
    }
    MOL_SPTR_VECT::const_iterator endProductTemplates() const {
        return this->m_productTemplates.end();    
    }
    unsigned int getNumReactantTemplates() const { return this->m_reactantTemplates.size(); };
    unsigned int getNumProductTemplates() const { return this->m_productTemplates.size(); };

    //! initializes our internal reactant-matching datastructures.
    /*! 
        This must be called after adding reactants and before calling
        runReactants.
    */
    void initReactantMatchers();
        
    //! validates the reactants and products to make sure the reaction seems "reasonable"
    /*! 
        \return   true if the reaction validates without errors (warnings do not stop validation)
        
        \param numWarnings: used to return the number of validation warnings
        \param numErrors:   used to return the number of validation errors
        
        \param silent: If this bool is true, no messages will be logged during the validation. 
                       By default, validation problems are reported to the warning and error 
                       logs depending on their severity.
                       
    */
    bool validate(unsigned int &numWarnings,unsigned int &numErrors,bool silent=false) const;
        

    //! returns whether or not the reaction uses implicit
    //! properties on the product atoms
    /*!

      This toggles whether or not unspecified atomic properties in the
      products are considered to be implicit and should be copied from
      the actual reactants. This is necessary due to a semantic difference
      between the "reaction SMARTS" approach and the MDL RXN
      approach:
        In "reaction SMARTS", this reaction:
          [C:1]-[Br:2].[O-:3]>>[C:1]-[O:3].[Br-:2]
        applied to [CH4+]Br should yield [CH4+]O
        Something similar drawn in an rxn file, and applied to
        [CH4+]Br should yield [CH3]O. 
        In rxn there is no charge on the product C because nothing is
        specified in the rxn file; in "SMARTS" the charge from the
        actual reactants is not *removed* because no charge is
        specified in the reaction.

    */
    bool getImplicitPropertiesFlag() const { return df_implicitProperties; };
    //! sets the implicit properties flag. See the documentation for
    //! getImplicitProertiesFlag() for a discussion of what this means.
    void setImplicitPropertiesFlag(bool val) { df_implicitProperties=val; };

  private:
    bool df_needsInit;
    bool df_implicitProperties;
    MOL_SPTR_VECT m_reactantTemplates,m_productTemplates;
    ChemicalReaction &operator=(const ChemicalReaction &); // disable assignment
    MOL_SPTR_VECT generateOneProductSet(const MOL_SPTR_VECT &reactants,const std::vector<MatchVectType> &reactantsMatch) const;
  };

} // end of RDKit namespace

#endif

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